51单片机秒表程序-00-99秒

#includereg52.h#defineucharunsignedchar//宏定义用uchar代替unsignedchar#defineuintunsignedintsbitSTART=P1^0;//开始、停止键低电平有效sbitRST=P1^1;//复位键sbitSMGGW=P1^2;//用三极管或驱动芯片驱动数码管高电平有效还是低电平有效由电路决定sbitSMGSW=P1^3;uchartt;uinttime;//此变量为时间ucharcodetable[]={//此为数码管字模，对应0--90x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};voidDelay(uintms)//延时子函数{uinti,j;for(i=ms;i0;i--)for(j=500;j0;j--);}voidDisplay()//显示子函数{ucharge,shi;shi=time/10;ge=time%10;P0=table[ge];SMGGW=0;//用三极管或驱动芯片驱动数码管高电平有效还是低电平有效由电路决定本程序为低电平数码管亮SMGSW=1;Delay(2);P0=table[shi];SMGGW=1;SMGSW=0;Delay(2);}voidmain(){P1=0xff;EA=1;ET0=1;TMOD=0x01;TH0=0x4c;//晶振11.0592Mhz若用12Mhz晶振则改为TH0=0x3c;Tl0=0xb0;TL0=0x00;TR0=0;while(1){if(START==0)//开始、停止{Delay(8);if(START==0){TR0=!TR0;while(!START)Display();}}if(RST==0)//复位{Delay(8);if(RST==0){time=0;while(!RST)Display();}}if(tt==20){tt=0;time++;if(time==99){time=0;}}Display();}}voidtimer0()interrupt1{TH0=0x4c;//晶振11.0592Mhz若用12Mhz晶振则改为TH0=0x3c;Tl0=0xb0;TL0=0x00;tt++;}